Synthesis and Photoluminescence Properties of Pb²⁺-Doped K₂Al₂B₂O₇

Ultraviolet-emitting phosphors with the formula K_2–xPb_xAl₂B₂O₇ (0.0025 ≤ x ≤ 0.03) were synthesized at 850°C for 6 h in air. The powder X-ray diffraction technique was used to analyze the phases of all prepared borates. The FTIR technique was used to examine the bond structure of K₂Al₂B₂O₇. At room temperature, a spectrofluorometer was used to examine the photoluminescence characteristics of the prepared phosphors. K₂Al₂B₂O₇:Pb²⁺ was found to have emission and excitation bands at 373 and 271 nm, respectively. An extensive investigation was conducted on the correlation between emission intensity and Pb²⁺ content for K_2–xPb_xAl₂B₂O₇. Consequently, 0.01 mol Pb²⁺ was found to be the optimal concentration in K₂Al₂B₂O₇. Eventually, it was found that the Stokes shift of the prepared material K₂Al₂B₂O₇:Pb²⁺ is 10,090 cm⁻¹ using the excitation band at 271 nm and the emission band at 373 nm. As a result of this investigation, a brand-new UVA radiation-emitting material has been established.